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## HackerRank – 30 Days of Code – Day 8: Dictionaries and Maps – Ruby Program

Objective Today, we’re learning about Key-Value pair mappings using a Map or Dictionary data structure. Check out the Tutorial tab for learning materials and an instructional video! Task Given n names and phone numbers, assemble a phone book that maps friends’ names to their respective phone numbers. You will then be given an unknown number […]

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## HackerRank – 30 Days of Code – Day 7: Arrays – Ruby Program

Objective Today, we’re learning about the Array data structure. Check out the Tutorial tab for learning materials and an instructional video! Task Given an array, A, of N integers, print A’s elements in reverse order as a single line of space-separated numbers. Input Format The first line contains an integer, N(the size of our array). […]

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## HackerRank – 30 Days of Code – Day 6: Let’s Review – Ruby Program

Objective Today we’re expanding our knowledge of Strings and combining it with what we’ve already learned about loops. Check out the Tutorial tab for learning materials and an instructional video! Task Given a string, S, of length N that is indexed from 0 to N-1, print its even-indexed and odd-indexed characters as 2 space-separated strings […]

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## HackerRank – 30 Days of Code – Day 5: Loops – Ruby Program

Objective In this challenge, we’re going to use loops to help us do some simple math. Check out the Tutorial tab to learn more. Task Given an integer, n, print its first 10 multiples. Each multiple n x i (where 1<=i<=10) should be printed on a new line in the form: n x i = […]

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## HackerRank – 30 Days of Code – Day 4: Class vs. Instance – Ruby Program

Objective In this challenge, we’re going to learn about the difference between a class and an instance; because this is an Object Oriented concept, it’s only enabled in certain languages. Check out the Tutorial tab for learning materials and an instructional video! Task Write a Person class with an instance variable, age, and a constructor […]

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## HackerRank – 30 Days of Code – Day 3: Intro to Conditional Statements – Ruby Program

Objective In this challenge, we’re getting started with conditional statements. Check out the Tutorial tab for learning materials and an instructional video! Task Given an integer, n, perform the following conditional actions: If n is odd, print Weird If n is even and in the inclusive range of 2 to 5, print Not Weird If […]

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## HackerRank – 30 Days of Code – Day 2: Operators – Ruby Program

Objective In this challenge, you’ll work with arithmetic operators. Check out the Tutorial tab for learning materials and an instructional video! Task Given the meal price (base cost of a meal), tip percent (the percentage of the meal price being added as tip), and tax percent (the percentage of the meal price being added as […]

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## HackerRank – 30 Days of Code – Day 1: Data Types – Ruby Program

Objective Today, we’re discussing data types. Check out the Tutorial tab for learning materials and an instructional video! Task Complete the code in the editor below. The variables i, d,s Â and are already declared and initialized for you. You must: Declare 3 variables: one of type int, one of type double, and one of type […]

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## HackerRank – 30 Days of Code – Day 0: Hello, World. – Ruby Program

Objective In this challenge, we review some basic concepts that will get you started with this series. You will need to use the same (or similar) syntax to read input and write output in challenges throughout HackerRank. Check out the Tutorial tab for learning materials and an instructional video! Task To complete this challenge, you […]